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John and Mary own shares of stock in a certain company. Does John own more shares of the company's stock than Mary?
(1) Mary owns more than 500 shares of the company's stock.
(2) The number of shares of the company's stock that John owns is 400 less than twice the number of shares of the company's stock that Mary owns.
这两个条件的式子都很好列,条件一:M>500,条件二:2M-J=400,由条件二推出J>600,然后就可以比较出谁大谁小吗?答案是C,M=550,J=610的时候M小啊,M=650,J=610的时候M大啊~~为什么是充分的~~~ |
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